The Lone Star Racing Rear Gusset Plate for the Yamaha Rhino is designed to reduce rear frame flex which leads to chassis failure. It gives you two hook points for tieing down or pulling. The plate is laser cut from heavy gauge chromoly steel. It bolts onto the rear a-arm mounts and includes new hardware. There is a special tab that mounts to the bottom of the rear differential that add a significant amount of strength and reliability to the rear end. No drilling is required.